Ronald Cron 3b056202d3 tls13: keys: Do not use handshake->premaster ...

`handshake->premaster` was used to store the
(EC)DHE shared secret but in TLS 1.3 there is
no need to store it in a context.

Futhermore, `handshake->premaster` and more
specifically its sizing is TLS 1.2 specific
thus better to not use it in TLS 1.3.

Allocate a buffer to store the shared secret
instead. Allocation instead of a stack buffer
as the maintenance of the size of such buffer
is harder (new elliptic curve for ECDHE,
support for FFDHE ... ).

Signed-off-by: Ronald Cron <ronald.cron@arm.com>

2022-10-21 14:34:20 +02:00

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